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diff --git a/org.argeo.util/src/main/java/org/argeo/util/security/Keyring.java b/org.argeo.util/src/main/java/org/argeo/util/security/Keyring.java
new file mode 100644
index 000000000..10dbabd49
--- /dev/null
+++ b/org.argeo.util/src/main/java/org/argeo/util/security/Keyring.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.argeo.util.security;
+
+import java.io.InputStream;
+
+/**
+ * Access to private (typically encrypted) data. The keyring is responsible for
+ * retrieving the necessary credentials. <b>Experimental. This API may
+ * change.</b>
+ */
+public interface Keyring {
+	public void changePassword(char[] oldPassword, char[] newPassword);
+
+	/**
+	 * Returns the confidential information as chars. Must ask for it if it is
+	 * not stored.
+	 */
+	public char[] getAsChars(String path);
+
+	/**
+	 * Returns the confidential information as a stream. Must ask for it if it
+	 * is not stored.
+	 */
+	public InputStream getAsStream(String path);
+
+	public void set(String path, char[] arr);
+
+	public void set(String path, InputStream in);
+}